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"Gem-Knight Lapis" + 1 "Gem-Knight" monsterMust first be Fusion Summoned with the above Fusion Materials. You can only Special Summon "Gem-Knight Lady Lapis Lazuli(s)" once per turn. Once per turn: You can send 1 "Gem-Knight" monster from your Main Deck or Extra Deck to the Graveyard, and if you do, inflict 500 damage to your opponent for each Special Summoned monster on the field.

How to Get

Evaluation

Pros

Can send 1 Gem-Knight monster from your Main Deck or Extra Deck to the Graveyard to inflict 500 LP damage per Special Summoned monster on the Field.

Good ATK stats

Cons

Gem-Knight Lapis must be 1 of the Fusion material.

Weak DEF stats.

Can only be Special Summoned once per turn.

Tips

Fusion Support

You are most likely required to use Polymerization to Fusion Summon, therefore you can use these cards to support your Fusion actions. Fusion Recycling Plant can recycle 1 fusion material monster to your hand, and also search for Polymerization from your deck. King of the Swamp can be treated as 1 fusion material required for Fusion Summon, and at the same time it also can be used to search 1 Polymerization from your Deck. Fusion Sage can search 1 Polymerization from your deck. Defusion is a powerful follow-up card when you attack with your Fusion monster, as it can dissolve the Fusion monster to resummon the Fusion materials from your Graveyard, enabling you more attack options. Fusion Reserve allows you to add 1 of the Fusion materials listed on the Fusion monster to your hand, and add 1 Polymerization from your Graveyard to your Hand.

There's not really any synergy there. Using Delta as Fusion Material for Zirconia is about as deep as the combos go. You'd be better off focusing on one or the other, combining them would make both aspects noticeably worse.

Sometimes you can't just mash two decks together just because they have the same Type.

Jurrac and Evolsaur are both FIRE Dinosaur-Type archetype, but they focus on two different things (Jurrac is beatdown using high level main deck monsters, while Evolsaur is Rank 4 Xyz), that you can't just mash them together and think they'll work together somehow.

Is this combo possible?
1. Use her effect to send lazuli to the grave. Add lapis back to the hand.
2. Banish another gem knight in the grave for gem knight fusion
3. Fusion summon master diamond using lapis in the hand and lapis on the field.
4. Burn them again